You have posted conflicting messages this morning so not clear if you downloaded the beta or just registered?
If you downloaded it then it is possible to go back to Android 13 using smart switch but note a tiny number of users have reported issues doing so.
We are close to a stable release so if you have downloaded, my view is best to stay on beta now.
And yes you will get the stable version when it rolls out in the coming days or weeks.
I am not employed by Samsung nor do I receive any remuneration as a Samsung Members Star.
My device is an S25 Ultra.